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This is true because uranium is continuously creating more lead.
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If minerals are used for dating, the necessary checks on the ages are achieved by analyzing samples from more than one location and by analyzing different grain sizes or mineral types that respond differently to disturbing events.
It can be said that minerals provide a high degree of sample integrity that can be predicted on the basis of experience gained through numerous investigations under a variety of geologic conditions.
The slope is proportional to the geologic age of the system.
In practice, the isochron approach has many inherent advantages.
By careful selection, certain minerals that contain little or no daughter element but abundant parent element can be analyzed.
In this case, the slope of the line in ) dating of zircon, the zircon is found to exclude initial lead almost completely.
Certain rocks that cooled quickly at the surface were found to give precisely defined linear isochrons, but many others did not.
Some studies have shown that rubidium is very mobile both in fluids that migrate through the rock as it cools and in fluids that are present as the rock undergoes chemical weathering.
In whole rock isochron methods that make use of the rubidium–strontium or samarium–neodymium decay schemes (see below), a series of rocks or minerals are chosen that can be assumed to have the same age...